Callous building device for the fingers



FIG. 1 is a front elevational view of a callous building device for the fingers showing my new design;

FIG. 2 is a rear elevational view thereof;

FIG. 3 is a right side elevational view thereof;

FIG. 4 is a left side elevational view thereof;

FIG. 5 is a top plan view thereof; and,

FIG. 6 is a bottom plan view thereof. 

The ornamental design for a callous building device for the fingers, as shown. 